("Monitoring" technology is to insert a device that can receive and record the communication content between two computers communicating with each other through technical means, and finally realize the data recording of both sides of the communication. Generally, it is required that the equipment used as the monitoring channel should not cause abnormal behavior or connection interruption of both communication parties, that is, the monitoring party should not participate in the communication behavior of any party in the communication, and should only "passively" receive and record the communication data without tampering with it)